This is probably very common. You need to lie back and take a breather. I know from personal experience when one masturbates too much or often it becomes a replacement for sex with your partner and your relationship. However, if you are in a relationship or not, try not to *** until you are at a fully hard erect penis. You can train yourself/penis into reacting the way it is suppose to. You can come with a copletely un-erect penis but your future partner (s) may not appreciate this.
Hope this helps. Remember, keep it hard and up, or don't squirt!
This sounds normal,my husband does the same thing.It is normal,some times you might be tired,and think your not.You don't need to stress about it,if you stress about it then it will become more so to happen.Take a break and chill,don't be in a hurry to please your self,just go with the flow,enjoy your self,don't make it into a chore.